What’s the maximum amount I can invest at one time?
The maximum you can contribute to an ISA for the 2018/19 tax year is £20,000. The Lifetime ISA limit is £4,000 per tax year.
There is no limit to what you can invest in a GIA but there is a £20,000 limit to the amount you can invest on any one week.
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It's important you know
All investing should be regarded as longer term. The value of your investments can go up and down, and you may get back less than you invest.